Just heard about this on a non-webmaster forum, don't even see it in Google news yet. Don't have full details yet.....
Apparently Rush Limbaugh (a well known American conservative talking head) didn't like a website that advertised on the term 'SEC Goldman Sachs'. So he encouraged his listeners to search on the term, and then click on that website's ads. The idea was to drain their budget and shut down their advertising.
And because Rush Limbaugh's listenership is so widespread I bet this actually worked. I read that the offending ads are now removed.
My comments are:
1) this is interesting from the perspective of it being what I suspect is the first truly plausible full scale click fraud tactic. how can Google guard against that? Tough to do. It's also probably the first time click fraud or clickbombing (you read it here first) hit the mainstream.
2) Will we see more of this? Grassroots campaigns to take ad campaigns offline.
3) THere's opportunity here folks. If you're looking to advertise something, time to start bidding on that term! Apparently there's already at least one sharp web design firm doing it.